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Proceedings Paper

Pre-detector processing of three-dimensional incoherent image fields
Author(s): Robin D. Alcock; Neil A. Halliwell; Jeremy M. Coupland; Phillip Sutton; John Savage
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Paper Abstract

This paper describes a method to modify the point spread characteristics of an imaging system to perform convolution filtering of incoherent image fields prior to detection. The technique utilizes an aperture plane phase only optical element (kinoform) which is computer generated to optimize efficiency and is fabricated as a bleached hologram. In addition to providing a high speed alternative to digital enhancement of images, optical processing using this approach has several interesting properties. The most significant of these is the ability of the phase element to retain and process high spatial frequency image information from parts of the image which would otherwise be out of focus. As a result this technique allows an optical implementation of three- dimensional convolution filtering, a practical demonstration of which is given in this paper.

Paper Details

Date Published: 23 March 1998
PDF: 11 pages
Proc. SPIE 3386, Optical Pattern Recognition IX, (23 March 1998); doi: 10.1117/12.304753
Show Author Affiliations
Robin D. Alcock, Loughborough Univ. (United Kingdom)
Neil A. Halliwell, Loughborough Univ. (United Kingdom)
Jeremy M. Coupland, Loughborough Univ. (United Kingdom)
Phillip Sutton, Defence Evaluation and Research Agency Chertsey (United Kingdom)
John Savage, Defence Evaluation and Research Agency (United Kingdom)

Published in SPIE Proceedings Vol. 3386:
Optical Pattern Recognition IX
David P. Casasent; Tien-Hsin Chao, Editor(s)

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